I dont think that anyone here can really answer somthing that specific. Here's my idea, try phoning your nearest toyota dealer and aking them. They may be able to help you find out what you are looking for or even get a repair/maintanance manual for one.
I know how anoying it would be to have a problem so small, yet it effects everything.
Good luck on your quest and welcome to UCP.
Self confessed boost junkie:)
84' Nissan N12 EXA, E15ET turbo.....with upgraded turbo:)
UCP's biggest Afro on a white man!!!